diff --git a/format.c b/format.c
index 0c1be744..21f359ab 100644
--- a/format.c
+++ b/format.c
@@ -343,4 +343,10 @@ format_window_pane(struct format_tree *ft, struct window_pane *wp)
 	format_add(ft, "pane_id", "%%%u", wp->id);
 	format_add(ft, "pane_active", "%d", wp == wp->window->active);
 	format_add(ft, "pane_dead", "%d", wp->fd == -1);
+	if (wp->cmd != NULL)
+		format_add(ft, "pane_start_command", "%s", wp->cmd);
+	if (wp->cwd != NULL)
+		format_add(ft, "pane_start_path", "%s", wp->cwd);
+	format_add(ft, "pane_pid", "%ld", (long) wp->pid);
+	format_add(ft, "pane_tty", "%s", wp->tty);
 }
diff --git a/tmux.1 b/tmux.1
index 9dc8bb04..e554254e 100644
--- a/tmux.1
+++ b/tmux.1
@@ -2603,7 +2603,11 @@ The following variables are available, where appropriate:
 .It Li "pane_dead" Ta "1 if pane is dead"
 .It Li "pane_height" Ta "Height of pane"
 .It Li "pane_id" Ta "Unique pane id"
+.It Li "pane_pid" Ta "PID of first process in pane"
+.It Li "pane_start_command" Ta "Command pane started with"
+.It Li "pane_start_path" Ta "Path pane started with"
 .It Li "pane_title" Ta "Title of pane"
+.It Li "pane_tty" Ta "Pseudo terminal of pane"
 .It Li "pane_width" Ta "Width of pane"
 .It Li "session_attached" Ta "1 if session attached"
 .It Li "session_created" Ta "Integer time session created"